Are 42K Horses Better Than 10K Horses

No. All mounts in ESO are the same except for appearance. The horses sold in the stables for 42K, the mounts on the Crown Store and even the horse sold for 10K at the stables are all the same except for appearance.

Way back before Update 6 (1.6) the mounts had different starting stats but this has all changed! These days mounts don’t have ANY stats and instead your Speed, Mount Stamina and Carrying Capacity is determined with your Riding Skills. These can be viewed on your Character Screen and trained at the stables each day for a gold fee.

This also means that mounts can be shared between characters on the same account BUT your Speed, Mount Stamina and Carrying Capacity is different for all of your characters.

You can purchase Riding Lessons on the Crown Store to level your stats faster.